Success is often found when goals are aligned. By this I mean aligning
your goals to the REA's.

I think you are correct in deducing that a fast sale is of more value to
the REA than the incremental commission on a small increase to the sale
price.

The other factor is that properties go stale if they are on the market
for too long. Once they have been seen by potential buyers (i.e. in
advertisements) they become 'invisible' to those buyers. So the longer
it's on the market, the harder it is for the REA to sell (there are less
interested prospects), and the more prone to discounting the REA will
need to become to move it.

Therefore, speed of sale is really the only common goal between yourself
and the REA.

Perhaps your sales 'process' could involve a series of REA's on
relatively high incentive on relatively short term contracts. To support
your process, as you switch from one to the next, you need to have
different advertising collateral so the house looks different each time
it hits the market, so it becomes less invisible?

Since the REA is the constrained resource, all other activities would
need to subordinate e.g. be very supportive of adhoc inspections, etc.

I don't know what the rules are there, but you could package an
independent building inspection report etc, as this is something that
would usually take time for the potential buyer to organise and add to
their risk (in Australia this is the buyer's responsibility).

Mike